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Electromagnetic transmission device

a transmission device and electromagnetic technology, applied in the direction of printers, magnetic bodies, camera focusing arrangement, etc., can solve the problems of increasing the number, the size of the driver cannot be reduced, and the structure of the driver is complicated

Inactive Publication Date: 2010-06-01
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This configuration reduces electrical power consumption by utilizing a radial magnetization of the annular magnetic member to generate forces that assist in moving the lens module, allowing for precise positioning with less current strength and maintaining the lens module's position effectively without continuous electricity, thus addressing the issues of size, cost, and control precision.

Problems solved by technology

Thus, the structure of the driver is complicated, and the size thereof cannot be reduced.
The magnetic member 9 requirement, however, increases the number of constituent elements of the lens drive device, such that manufacturing costs and overall size of the lens drive device cannot be reduced.
Accordingly, positioning control of the lens 2 in the conventional lens drive device is difficult.
The yoke 3, however, adversely affects reduction of manufacturing costs and overall size of the lens drive device 1.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0029]Referring to FIG. 3 and FIG. 4, an electromagnetic transmission device 100 drives a lens module of a camera to move and comprises a fixed base 110, two opposite guide bars 120, a coil 130, a support base 140, an annular magnetic member 150, a resilient member 160, and two resilient rings 170. The fixed base 110, guide bars 120, coil 130, and resilient rings 170 may be regarded as fixed members of the electromagnetic transmission device 100, while the support base 140 and annular magnetic member 150 may be regarded as movable members thereof.

[0030]The guide bars 120 are connected to the fixed base 110. Here, the guide bars 120 comprise magnetic-permeable material (or one of the guide bars 120 comprises magnetic-permeable material). Additionally, as shown in FIG. 6, the guide bars 120 comprise a same first central height plane H1.

[0031]As shown in FIG. 3 and FIG. 4, the coil 130 is connected to the fixed base 110.

[0032]The support base 140 is movably fit on the guide bars 120. A...

second embodiment

[0041]Elements corresponding to those in the first embodiment share the same reference numerals.

[0042]Referring to FIG. 7, the difference between this and the first embodiments is that an electromagnetic transmission device 100′ of this embodiment further comprises a magnetic-permeable member 180 and the guide bars 120 comprise non-magnetic-permeable material.

[0043]The magnetic-permeable member 180 is connected to the fixed base 110 and comprises a first central height plane H1.

[0044]Structure, disposition, and function of other elements in this embodiment are the same as those in the first embodiment, and explanation thereof is omitted for brevity.

[0045]In this embodiment, the second central height plane H2 of the annular magnetic member 150 is designed to substantially align the first central height plane H1 of the magnetic-permeable member 180. Accordingly, when the electromagnetic transmission device 100′ is employed to drive a lens module L (as shown in FIG. 7) of a camera to m...

third embodiment

[0047]Referring to FIG. 8 and FIG. 9, an electromagnetic transmission device 300 drives a lens module L of a camera to move and comprises a fixed base 310, a support base 320, two magnetic-permeable members 330, a coil 340, an annular magnetic member 350, and a resilient member 360. The fixed base 310 and annular magnetic member 350 may be regarded as fixed members of the electromagnetic transmission device 300, while the support base 320, magnetic-permeable members 330, and coil 340 may be regarded as movable members thereof.

[0048]The support base 320 is movably connected to the fixed base 310. As shown in FIG. 9, the support base 320 can support or carry the lens module L.

[0049]The magnetic-permeable members 330 are connected to the support base 320 and comprise a same first central height plane H1.

[0050]The coil 340 is connected to the support base 320.

[0051]The annular magnetic member 350 is connected to the fixed base 310 and surrounds the coil 340. Specifically, a magnetizatio...

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Abstract

An electromagnetic transmission device. A guide bar connects to a fixed base and includes magnetic-permeable material and a first central height plane. A coil connects to the fixed base. A support base movably fits on the guide bar. An annular magnetic member connects to the support base and is surrounded by the coil. A magnetization direction of the annular magnetic member is perpendicular to a moving direction of the support base and annular magnetic member. The annular magnetic member includes a second central height plane. The coil interacts with the annular magnetic member to generate a first force. When moving to separate the second central height plane from the first central height plane, the annular magnetic member interacts with the guide bar to generate a second force, driving the support base and annular magnetic member to move along a direction perpendicular to the magnetization direction of the annular magnetic member.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The invention relates to electromagnetic transmission devices, and more particularly to electromagnetic transmission devices with reduced electrical power consumption.[0003]2. Description of the Related Art[0004]Microminiature image capturing devices are commonly applied in cellular phones, computers, vehicle radars, video game players, and medical inspection devices, etc. The microminiature image capturing devices have been developed to provide high definition quality, reduced power consumption, low manufacturing costs, and reduced size. As such, actuators disposed in the microminiature image capturing devices, for moving lens modules thereof, are critical.[0005]Automatic displacement driving devices applied in lens modules may employ drivers providing rotational power with a rotational axis thereof paralleling an optical axis of the lens modules or drivers providing movement power with a moving direction thereof paral...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01F7/08G02B7/02H02K41/00H02K35/00H02K33/00H01F7/00
CPCG02B7/08H01F7/1615H01F7/066
Inventor WANG, YUNG-HSINGTSAI, MENG-CHECHANG, YU-HSIUHORNG, JI-BIN
Owner IND TECH RES INST